My personal favorite. I was in Denver heading to lax and a pax comes up to me and asks me where her flight is leaving from, she says she doesn't see Denver anywhere on the monitors. I take a look at her boarding pass which says Tampa and confirm with her, " you're going to Tampa right?". She says but I don't see Denver anywhere. Confused, I ask her again " you're going to Tampa? Again she says the same, I don't see Denver anywhere. I said you are in Denver, you're going to Tampa ? She responds don't they list the flights by departure city?